WRNK2 dual armored thermocouple

NegotiableUpdate on 05/10

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Overview

WRNK2 dual armored thermocouple can directly measure the surface temperature of liquid, vapor, gas media, and solids in the range of 0 ℃ to 1800 ℃ during various production processes.

Product Details

WRNK2 dual armored thermocoupleThe working principle is that two conductors with different compositions are welded at both ends to form a circuit. The temperature measuring end is called the measuring end, and the wiring terminal end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

WRNK2 dual armored thermocoupleProduct Introduction

Industrial assembled thermocouples are commonly used as temperature sensors in conjunction with display instruments, recording instruments, and electronic regulators. It can directly measure the surface temperature of liquids, vapors, gases, and solids within the range of 0 ℃ to 1800 ℃ in various production processes.

According to national regulations, our factory has been producing platinum rhodium 30 platinum rhodium 6, platinum rhodium 10 platinum, nickel chromium nickel silicon, nickel chromium copper nickel, copper copper nickel, iron copper nickel and other types of thermocouples that comply with IEC standard division numbers since 1987. They should comply with JB/T9238-1999 standard.

Technical specifications of WRNK2 double armored thermocouple:

◆ Temperature measurement range and allowable error

Thermocouple category	code name	graduation mark	Temperature measurement range ℃	Allowable error Δ t ℃
platinum-rhodium₃₀-Platinum rhodium₆	WRR	B	0~1800	± 1.5 ℃ or ± 0.0025 t
platinum-rhodium₁₀-Platinum	WRP	S	0~1600	± 1.5 ℃ or ± 0.0025 t
Nickel chromium nickel silicon	WRN	K	0~1300	± 2.5 ℃ or ± 0.0075 」 t 」
Nickel chromium copper nickel	WRE	E	0~800	± 2.5 ℃ or ± 0.0075 」 t 」

Note: "t" is the measured temperature of the temperature sensing element.

◆ Thermal response time: When there is a step change in temperature, the output of the thermocouple changes to 50% of the change, and the time required is called the thermal response time, represented by T0.5.

The nominal pressure of a thermocouple generally refers to the static external pressure that the protective tube can withstand at room temperature without breaking. In fact, the allowable working pressure is not only related to the material and diameter wall thickness of the protective tube, but also to its structural form, installation method, insertion depth, as well as the flow rate and type of the measured medium.

◆ Thermocouple * Small insertion depth: should not be less than 8-10 times the outer diameter of its protective tube (except for special products).

◆ Thermocouple insulation resistance (room temperature): The test voltage for room temperature insulation resistance is DC 500V ± 50V. The atmospheric conditions for measuring room temperature insulation resistance are temperature 15-35 ℃, relative humidity 45%, and atmospheric pressure 86-106kPa

a. For thermocouples with a length greater than 1 meter, the product of the insulation resistance value at room temperature and its length should not be less than 100M Ω· m

Namely: Rr · L ≥ 100M Ω· m L>1m (where: Rr - insulation resistance value of thermocouple at room temperature M Ω L - length of thermocouple. m)

b. For thermocouples with a length ≤ 1 meter, the insulation resistance value at room temperature should not be less than 100M Ω

◆ Upper limit temperature insulation resistance: The upper limit temperature insulation resistance of the thermocouple should not be less than the specified value in the table below:

Upper limit temperature tm ℃	Test temperature t ℃	Resistance value M Ω
100≤tm＜300	t=tm	10
300≤tm＜500	t=tm	2
500≤tm＜850	t=tm	0.5
850≤tm＜1000	t=tm	0.08
1000≤tm＜1300	t=tm	0.02
tm＞1300	t=1300	0.02

working principle

The working principle of a thermocouple is that two conductors with different compositions are welded at both ends to form a circuit. The temperature measuring end is called the measuring end, and the wiring terminal end is called the reference end. When there is a temperature difference between the measuring end and the reference end, a thermal current will be generated in the circuit. When connected to a display instrument, the instrument will indicate the corresponding temperature value of the thermoelectric potential generated by the thermocouple.

The thermoelectric potential of a thermocouple will increase as the temperature at the measuring end rises. The magnitude of the thermoelectric potential is only related to the material of the thermocouple conductor and the temperature difference between the two ends, and is independent of the length and diameter of the thermoelectric electrode.

Prefabricated thermocouples are mainly composed of a junction box, protective tube, insulating sleeve, terminal block, and thermoelectric electrode, and are equipped with various installation and fixing devices.